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NEET Sample Paper NEET Sample Test Paper-79

  • question_answer
    Oxidation numbers of Mn and Cr in \[KMn{{O}_{4}}\] and \[{{\operatorname{K}}_{2}}C{{r}_{2}}{{O}_{7}}\] are

    A)  + 6 and + 7 respectively

    B)  + 7 and + 6 respectively

    C)  + 7 and + 7 respectively

    D)  + 6 and + 6 respectively

    Correct Answer: B

    Solution :

    Oxidation state of Mn in \[\operatorname{KMn}{{O}_{4}}\] can be determined as Let oxidation number of Mn in \[MnO_{4}^{-}\] is x \[\operatorname{x} +4\times \left( -\,2 \right)=-1, \,x=+7\] Let oxidation number of Cr in \[C{{r}_{2}}O_{7}^{-\,-}\] is x \[2x+7\times \left( -\,2 \right)=-\,2\] \[x=\frac{12}{2}\] \[=\,\,+\,6\]


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